Continuity mistake: When Richard spots Paddy laying on the ground, they sail over to him. As they run up the beach there's hardly any seaweed around Paddy's body. Yet when it cuts there is much more seaweed around him. Also to the right of the screen on the beach, there are some rocks, but when it cuts (in the same shots as the aforementioned mistake) another large rock appears.
Picture added by Hamster